.mudibei{
    display: flex;
    background-color: olivedrab;
    opacity: 0.8;
    font-size: 20px;
}
.bei1{
    display: flex;
    margin-left: 150px;
    margin-top: 20px;
}
.mudibei1{

    width: 50%;
    height: 720px;

}
.mudibei2{
    width: 50%;
    height: 720px;

}
ul{
    display: flex;

}
li{
    list-style-type: none;
    margin-left: 30px;
}
a{
    text-decoration: none;
}
a:hover {
    color: blue; /* 鼠标悬停时的颜色 */

}

/* 点击状态 */
a:active {
    color: red; /* 点击时的颜色 */
}